Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Request, B

[Skyblast7]

Hi, I have been having extremely slow speed and unstable insternet since the service started. I'm using TP-Link CR1900 which is a compatible model, modem and router in one. It's connected to the cable from the wall. There is no splitter . I moved to a new house in September and Comcast is the first provider. The new cables were wired in and out  done by the builder and Comcast. I ordered 300Mbps but the speed rarely closed to it. Most of day and night, the download speed is like moving between 0- 10Mbps while the upload speed is pretty steady bewteen 11-12 Mbps. Always failed to download even few MB size. I tried to have chat service with Tech department but not resolved. They requested only re-boot the modem.  Looking at the the log, it doens't seem to be a modem issue. What do I need to do? Any suggestion?

System Log

Time Priority Description

Time	Priority	Description
Fri Oct 23 20:48:07 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:54:11 2020	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Wed Oct 21 15:53:54 2020	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:53:43 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:53:34 2020	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:53:30 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:53:14 2020	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:53:02 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:52:56 2020	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:52:52 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Tue Oct 20 21:54:43 2020	Warning (5)	Unicast DSID PSN startup error
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Tue Oct 20 12:42:39 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC={removed};CMTS-MAC={removed}...

Start Up Procedure

Procedure Status Comment

Procedure	Status	Comment
Acquire Downstream Channel	451750000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK	d11_m_cr1900_speedtierextreme2_c01.cm
Security	Enabled	BPI+

Downstream Bonded Channels

Channel Status Modulation Channel ID Frequency Power SNR

Channel	Status	Modulation	Channel ID	Frequency	Power	SNR
1	Locked	QAM256	1	451750000 Hz	-12.9 dBmV	37.5 dB
2	Locked	QAM256	2	457750000 Hz	-13.0 dBmV	37.5 dB
3	Locked	QAM256	3	463750000 Hz	-13.0 dBmV	37.3 dB
4	Locked	QAM256	4	469750000 Hz	-13.1 dBmV	37.3 dB
5	Locked	QAM256	5	475750000 Hz	-12.5 dBmV	38.1 dB
6	Locked	QAM256	6	481750000 Hz	-12.6 dBmV	37.9 dB
7	Locked	QAM256	7	487750000 Hz	-12.8 dBmV	37.7 dB
8	Locked	QAM256	8	493750000 Hz	-12.8 dBmV	37.7 dB
9	Locked	QAM256	9	499750000 Hz	-12.6 dBmV	33.5 dB
10	Not Locked	unknown	10	505750000 Hz	-12.7 dBmV	0.0 dB
11	Not Locked	unknown	11	511750000 Hz	-12.8 dBmV	0.0 dB
12	Locked	QAM256	12	517750000 Hz	-13.0 dBmV	29.2 dB
13	Locked	QAM256	13	523750000 Hz	-12.5 dBmV	33.8 dB
14	Locked	QAM256	14	529750000 Hz	-12.6 dBmV	37.3 dB
15	Locked	QAM256	15	535750000 Hz	-12.7 dBmV	36.5 dB
16	Locked	QAM256	16	541750000 Hz	-12.8 dBmV	34.3 dB
17	Locked	QAM256	17	547750000 Hz	-11.8 dBmV	34.7 dB
18	Locked	QAM256	18	553750000 Hz	-11.8 dBmV	31.6 dB
19	Locked	QAM256	19	559750000 Hz	-11.9 dBmV	33.0 dB
20	Locked	QAM256	20	565750000 Hz	-12.0 dBmV	31.8 dB
21	Locked	QAM256	21	571750000 Hz	-11.8 dBmV	38.2 dB
22	Not Locked	unknown	22	577750000 Hz	-11.9 dBmV	0.0 dB
23	Locked	QAM256	23	583750000 Hz	-12.0 dBmV	26.5 dB
24	Not Locked	unknown	24	589750000 Hz	-12.0 dBmV	0.0 dB

Upstream Bonded Channels

Channel Status Channel Type Channel ID Symbol Rate Frequency Power

Channel	Status	Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	5	5120 ksym/sec	36500000 Hz	49.8 dBmV
2	Locked	ATDMA	6	5120 ksym/sec	30100000 Hz	49.8 dBmV
3	Locked	ATDMA	7	5120 ksym/sec	23700000 Hz	48.3 dBmV
4	Locked	ATDMA	8	5120 ksym/sec	17300000 Hz	48.3 dBmV
5	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV

Sometimes downstream info is empty like below.

Downstream Bonded Channels

Channel Status Modulation Channel ID Frequency Power SNR

Channel	Status	Modulation	Channel ID	Frequency	Power	SNR
--	--	--	--	--	--	--

[CCAndrew]

Basically, your downstream signal is trashed. Too low, out of spec and non-existent SNR on some channels. Can you take your modem to your demarcation before any splitters and test your levels again. Its the difference between an inside or outside issue. Age of cables don’t really matter, they can go bad anytime

[Skyblast7]

Thank you for your reponse. I connected the modem to the black cable before the splitter in the utility room.  Here's what I captured. Now things changed. 

Start Up Procedure

Procedure	Status	Comment
Acquire Downstream Channel	547750000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK	d11_m_cr1900_speedtierextreme2_c01.cm
Security	Enabled	BPI+

Downstream Bonded Channels

Channel	Status	Modulation	Channel ID	Frequency	Power	SNR
1	Locked	QAM256	17	547750000 Hz	-1.7 dBmV	40.1 dB
2	Locked	QAM256	1	451750000 Hz	-2.3 dBmV	40.1 dB
3	Locked	QAM256	2	457750000 Hz	-2.4 dBmV	40.1 dB
4	Locked	QAM256	3	463750000 Hz	-2.5 dBmV	39.9 dB
5	Locked	QAM256	4	469750000 Hz	-2.5 dBmV	40.0 dB
6	Locked	QAM256	5	475750000 Hz	-1.9 dBmV	40.4 dB
7	Locked	QAM256	6	481750000 Hz	-2.0 dBmV	40.3 dB
8	Locked	QAM256	7	487750000 Hz	-2.1 dBmV	40.3 dB
9	Locked	QAM256	8	493750000 Hz	-2.2 dBmV	40.3 dB
10	Locked	QAM256	9	499750000 Hz	-1.8 dBmV	40.7 dB
11	Locked	QAM256	10	505750000 Hz	-1.9 dBmV	37.7 dB
12	Locked	QAM256	11	511750000 Hz	-2.0 dBmV	40.4 dB
13	Locked	QAM256	12	517750000 Hz	-2.1 dBmV	39.9 dB
14	Locked	QAM256	13	523750000 Hz	-1.7 dBmV	40.0 dB
15	Locked	QAM256	14	529750000 Hz	-1.8 dBmV	39.9 dB
16	Locked	QAM256	15	535750000 Hz	-1.8 dBmV	40.0 dB
17	Locked	QAM256	16	541750000 Hz	-0.9 dBmV	41.3 dB
18	Locked	QAM256	18	553750000 Hz	-0.7 dBmV	41.3 dB
19	Locked	QAM256	19	559750000 Hz	-0.7 dBmV	41.3 dB
20	Locked	QAM256	20	565750000 Hz	-0.7 dBmV	41.4 dB
21	Locked	QAM256	21	571750000 Hz	-0.3 dBmV	41.4 dB
22	Locked	QAM256	22	577750000 Hz	-0.4 dBmV	41.3 dB
23	Locked	QAM256	23	583750000 Hz	-0.4 dBmV	41.4 dB
24	Locked	QAM256	24	589750000 Hz	-0.4 dBmV	41.4 dB

Upstream Bonded Channels

Channel	Status	Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	5	5120 ksym/sec	36500000 Hz	41.8 dBmV
2	Locked	ATDMA	6	5120 ksym/sec	30100000 Hz	41.8 dBmV
3	Locked	ATDMA	7	5120 ksym/sec	23700000 Hz	41.8 dBmV
4	Locked	ATDMA	8	5120 ksym/sec	17300000 Hz	40.3 dBmV
5	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV

[EG]

Obviously, there is too much signal loss with the splitter / wiring / hardware.

[Skyblast7]

Umm, the splitter was connected by the Comcast technician on September 29. Can it be a bad one? Should I call a tech to check further? In-house wiring belongs to the builder. I'm afraid what I should do if it's a cause of the problem. What can be a hardware issue? Do you mean the modem?

Can you please advise where I should start? 

[CCAndrew]

What type of splitter? What other services do you have? Try the modem again where you had it originally and see if anything changed when you took the cables off.

[Skyblast7]

It's HomeConnect® Four-way Splitter with red color lable.  I have Blast internet service.

SV4G  HomeConnect® Four-way Splitter, 5–1002 MHz

I place the modem on the 1st floor and the splitter is located in the basement.  Do you mean taking off all the cables from the splitter but the one connected to the modem?

[Skyblast7]

I have the internet service only. I didn't try to disconnect three cables to connected to other rooms and none of them are used. 

[CCAndrew]

If all you have is internet, the splitter isn’t necessary. Removing it will, increase your downstream levels and decrease your upstream levels by about 7db. It may not be the solution but it’s a starting point

[Skyblast7]

I ordered a 3GHz rated RG6  cable extension to remove the splitter and connect the first cable to the house and the cable wired to the room where the modem is placed. Hope this reduces signal leakage. Will see how it makes difference and post the result. Thanks!

[Skyblast7]

I connected two cables directly with the extension.  Here's the connection information. It's changed as you indicated.  Still hard to believe that the new splitter is bad. Good thing is, I do not need to use the splitter. Thank you so much!

Start Up Procedure

Procedure	Status	Comment
Acquire Downstream Channel	571750000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK	d11_m_cr1900_speedtierextreme2_c01.cm
Security	Enabled	BPI+

Downstream Bonded Channels

Channel	Status	Modulation	Channel ID	Frequency	Power	SNR
1	Locked	QAM256	21	571750000 Hz	-5.1 dBmV	40.2 dB
2	Locked	QAM256	1	451750000 Hz	-5.3 dBmV	40.0 dB
3	Locked	QAM256	2	457750000 Hz	-5.4 dBmV	39.9 dB
4	Locked	QAM256	3	463750000 Hz	-5.5 dBmV	39.8 dB
5	Locked	QAM256	4	469750000 Hz	-5.5 dBmV	39.9 dB
6	Locked	QAM256	5	475750000 Hz	-4.9 dBmV	40.3 dB
7	Locked	QAM256	6	481750000 Hz	-5.0 dBmV	40.2 dB
8	Locked	QAM256	7	487750000 Hz	-5.2 dBmV	40.1 dB
9	Locked	QAM256	8	493750000 Hz	-5.2 dBmV	40.1 dB
10	Locked	QAM256	9	499750000 Hz	-4.9 dBmV	33.9 dB
11	Locked	QAM256	10	505750000 Hz	-5.1 dBmV	29.1 dB
12	Locked	QAM256	11	511750000 Hz	-5.2 dBmV	35.8 dB
13	Locked	QAM256	12	517750000 Hz	-5.3 dBmV	37.7 dB
14	Locked	QAM256	13	523750000 Hz	-4.8 dBmV	39.7 dB
15	Locked	QAM256	14	529750000 Hz	-4.9 dBmV	40.2 dB
16	Locked	QAM256	15	535750000 Hz	-5.0 dBmV	40.2 dB
17	Locked	QAM256	16	541750000 Hz	-4.2 dBmV	40.8 dB
18	Locked	QAM256	17	547750000 Hz	-4.0 dBmV	40.8 dB
19	Locked	QAM256	18	553750000 Hz	-4.0 dBmV	40.3 dB
20	Locked	QAM256	19	559750000 Hz	-4.0 dBmV	40.3 dB
21	Locked	QAM256	20	565750000 Hz	-4.2 dBmV	40.4 dB
22	Locked	QAM256	22	577750000 Hz	-4.1 dBmV	39.5 dB
23	Locked	QAM256	23	583750000 Hz	-4.1 dBmV	37.8 dB
24	Locked	QAM256	24	589750000 Hz	-4.1 dBmV	38.0 dB

Upstream Bonded Channels

Channel	Status	Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	7	5120 ksym/sec	23700000 Hz	41.3 dBmV
2	Locked	ATDMA	5	5120 ksym/sec	36500000 Hz	42.8 dBmV
3	Locked	ATDMA	6	5120 ksym/sec	30100000 Hz	41.3 dBmV
4	Locked	ATDMA	8	5120 ksym/sec	17300000 Hz	41.3 dBmV
5	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV

[Skyblast7]

It looks the problem came back.  Download unsteady and slow. Upload same as before.  I 'm going to try to connect the modem in other room without splitter.  Sigh

System Log

Time	Priority	Description
Thu Nov 05 13:50:49 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Thu Nov 05 10:31:47 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC={removed};CMTS-MAC={removed}...
Thu Nov 05 10:31:45 2020	Warning (5)	MDD message timeout;CM-MAC={removed};CMTS-MAC=2{removed};CM-QOS=1.1;CM-VER=3.0;

Downstream Bonded Channels

Channel	Channel	Modulation	Channel ID	Frequency	Power	SNR
1	Locked	QAM256	21	571750000 Hz	-6.3 dBmV	39.7 dB
2	Locked	QAM256	1	451750000 Hz	-6.2 dBmV	39.4 dB
3	Locked	QAM256	2	457750000 Hz	-6.3 dBmV	39.5 dB
4	Locked	QAM256	3	463750000 Hz	-6.3 dBmV	39.0 dB
5	Locked	QAM256	4	469750000 Hz	-6.4 dBmV	39.4 dB
6	Locked	QAM256	5	475750000 Hz	-5.8 dBmV	39.9 dB
7	Locked	QAM256	6	481750000 Hz	-5.9 dBmV	39.4 dB
8	Locked	QAM256	7	487750000 Hz	-6.2 dBmV	39.7 dB
9	Locked	QAM256	8	493750000 Hz	-6.1 dBmV	39.7 dB
10	Not Locked	unknown	9	499750000 Hz	-5.6 dBmV	0.0 dB
11	Not Locked	unknown	10	505750000 Hz	-5.4 dBmV	0.0 dB
12	Not Locked	unknown	11	511750000 Hz	-6.1 dBmV	0.0 dB
13	Not Locked	unknown	12	517750000 Hz	-6.3 dBmV	0.0 dB
14	Locked	QAM256	13	523750000 Hz	-5.9 dBmV	31.5 dB
15	Locked	QAM256	14	529750000 Hz	-6.0 dBmV	34.2 dB
16	Locked	QAM256	15	535750000 Hz	-6.2 dBmV	32.8 dB
17	Locked	QAM256	16	541750000 Hz	-5.4 dBmV	30.5 dB
18	Locked	QAM256	17	547750000 Hz	-5.4 dBmV	31.2 dB
19	Locked	QAM256	18	553750000 Hz	-5.4 dBmV	26.7 dB
20	Locked	QAM256	19	559750000 Hz	-5.4 dBmV	31.1 dB
21	Locked	QAM256	20	565750000 Hz	-5.7 dBmV	27.6 dB
22	Not Locked	unknown	22	577750000 Hz	-5.5 dBmV	0.0 dB
23	Not Locked	unknown	23	583750000 Hz	-5.5 dBmV	0.0 dB
24	Not Locked	unknown	24	589750000 Hz	-5.5 dBmV	0.0 dB

Upstream Bonded Channels

Channel	Status	Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	7	5120 ksym/sec	23700000 Hz	43.8 dBmV
2	Locked	ATDMA	5	5120 ksym/sec	36500000 Hz	44.8 dBmV
3	Locked	ATDMA	6	5120 ksym/sec	30100000 Hz	44.3 dBmV
4	Locked	ATDMA	8	5120 ksym/sec	17300000 Hz	41.8 dBmV
5	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 ksym/sec	0 Hz	0.0 dBmV

[Skyblast7]

I placed the modem in other room and monitored 4 days. Surprisingly no error has been logged. System log is clean so far and the connection information is good. Eveything works good.  That says the cable wired to the original place causes loose signal. I'm wondering how it can be fixed or replaced thourgh the wall. It's good to have at least one working though it's not in the best location for wifi.